It seems that he recorded all the guitars by himself, there are pieces with 2 or 3 guitars, sometimes 4, but mainly 2 guitars, one with the rythm and one with the leads, there are no other instruments, but there are a lot of effects (very well used).Buckethead is very conceptual when he composes, unlike most of the musicians out there, and thats not good or bad, is just something he does.